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6.11 IGNITION SWITCH OPEN DURING IGNITION
The Ignition Switch (and the Purge Switch) is located on the Air/Fuel Valve. To check the
switch, proceed as follows:
1. Set the unit's ON/OFF switch to the OFF position.
2. Place the unit in Manual Mode and set the valve position between 25% and 30%.
3. Remove the Air/Fuel Valve cover (Figure 6-6) by rotating the cover counterclockwise to
unlock and lift up to remove.
4. Remove one of the two wires (#169 or #170) from the Ignition Switch (Figure 6-7).
5. Initiate a unit start sequence.
6. The unit should begin its start sequence and then shut down and display IGN SWITCH
OPEN DURING IGNITION.
7. Replace the wire on the Ignition Switch and press the CLEAR button. The unit should
restart.
AIR/FUEL VALVE COVER
(Rotate Counter-Clock-Wise
to Remove)
Page 80 of 184
Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Ignition Switch Open During Ignition
BLOWER
PROOF
SWITCH
Figure 6-6: Air/Fuel Valve Cover Location
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
AIR/FUEL
VALVE
BLOCKED
INLET
SWITCH
OMM-0097_0C
GF-142
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